I don't know what's up with mine, but I get a very F'd up throttle response every once in a while. Way worse than the hesitation the car came with stock.
Think back to when you first learned to drive a stick shift. Every once in a while you'd let the clutch out a little too soon and the car would jerk like crazy.Well, mine does that through every gear I'd say at least once or twice a week if you push to even half throttle. It's so bad that it's almost impossible to get on the freeway when it's doing it. A minute or two later, everything is smooth as ever. I need to get a laptop so I can get some A/F ratios...